add whitelist to join dao extrinsic

[2075]

User Story

As #user I want to join a dao. based on the dao settings there are three ways to allow the user to call the join extrinsic and effectively join a dao:

• open: no retrictions
• prime: prime adds user wallet address to whitelist
• voting: a dao voting adds the user wallet address to whitelist

Acceptance Criteria

A. simple poc route:

• 1 add member state to organisation graph to allow frontend to list users to whitelist
• 2 user calls join ext -> add state active or pending when private dao
• 3 user join ext executes, but state pending
• 4 prime changes state via ext to active

B. long term route

Part I

• 1. user can call join ext for open dao and becomes member
• 2. user can call join ext for private dao and gets rejected
• 3. prime manually adds a list of addresses to the whitelist, users call ext to join and become member
• 4. dao voting adds a list of addresses to the whitelist, users call ext to join and become member
  bonus level
• 5. user calls apply ext which creates a proposal vote to whitelist address

Part II

• add binary vote for prime
• add binary vote for dao members
• add auto create proposal for member applications
• user create proposal containing address list

example

• create a proposal containing a list
• this list is contained in the voting
• approval adds the list to whitelist

Additional Information

• check parity whitelist pallet
• if whitelist not sufficeint, we can use memberState and let all users call ext to join but state becomes pending and vote is initiated.

How to test

1. call ext and become member